ORCID Profile
0000-0003-4006-9523
Current Organisation
UNSW
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Publisher: Springer Science and Business Media LLC
Date: 22-11-2018
Publisher: Elsevier BV
Date: 10-2020
Publisher: Cambridge University Press (CUP)
Date: 15-04-2020
DOI: 10.1017/S144618112000005X
Abstract: We consider the numerical solution of competitive exothermic and endothermic reactions in the presence of a chaotic advection flow. The resulting behaviour is characterized by a strong dependence on the competitive reaction history. The burnt temperature is not immediately connected to simple enthalpy calculations, so there is a subtlety in the interplay between the major parameters, notably the Damköhler number, the ratio of the heats of exothermic and endothermic reactions, as well as the ratio of their respective activation energies. This paper seeks to explore the way these parameters affect the steady states of these reaction fronts and their stability.
Publisher: MDPI AG
Date: 27-10-2023
Publisher: EDP Sciences
Date: 2018
DOI: 10.1051/MMNP/2018047
Abstract: We consider non-adiabatic combustion waves arising from two-step competitive exothermic reaction schemes. A numerical method is employed to study the behaviour of this system and we show that the inclusion of heat loss can lead to a period-doubling route to the termination of the propagating flame front. The nature of oscillations becomes more complex with increasing loss of heat until the system can no longer sustain a propagating front. In other words, beyond some critical value of heat loss, extinction of the combustion reaction would occur. For the non-adiabatic case, particularly close to the extinction threshold, large excursions in temperature and wave speed above those observed for the adiabatic case can occur. Such behaviour close to extinction may have implications for safety or industrial processes.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 05-2021
Publisher: Institute for Operations Research and the Management Sciences (INFORMS)
Date: 11-2021
Abstract: Traditional combat models, such as Lanchester’s equations, are typically limited to two competing populations and exhibit solutions characterized by exponential decay—and growth if logistics are included. We enrich such models to account for modern and future complexities, particularly around the role of interagency engagement in operations as often displayed in counterinsurgency operations. To address this, we explore incorporation of nontrophic effects from ecological modeling. This provides a global representation of asymmetrical combat between two forces in the modern setting in which noncombatant populations are present. As an ex le, we set the noncombatant population in our model to be a neutral agency supporting the native population to the extent that they are noncombatants. Correspondingly, the opposing intervention force is under obligations to enable an environment in which the neutral agency may undertake its work. In contrast to the typical behavior seen in the classic Lanchester system, our model gives rise to limit cycles and bifurcations that we interpret through a warfighting application. Finally, through a case study, we highlight the importance of the agility of a force in achieving victory when noncombatant populations are present.
Publisher: Elsevier BV
Date: 05-2019
No related grants have been discovered for Simon Watt.